27 agosto 2017

A Fleeting Double Eclipse of the Sun


Last week, for a fraction of a second, the Sun was eclipsed twice. One week ago today, many people in North America were treated to a standard, single, partial solar eclipse. Fewer people, all congregated along a narrow path, experienced the eerie daytime darkness of a total solar eclipse. A dedicated few with fast enough camera equipment, however, were able to capture a double eclipse -- a simultaneous partial eclipse of the Sun by both the Moon and the International Space Station (ISS). The Earth-orbiting ISS crossed the Sun in less than a second, but to keep the ISS from appearing blurry, exposure times must be less than 1/1000th of a second. The featured image composite captured the ISS multiple times in succession as it zipped across the face of the Sun. The picture was taken in a specific color emitted by hydrogen which highlights the Sun's chromosphere, a layer hotter and higher up than the usually photographed photosphere.

from NASA http://ift.tt/2wShbvy
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There have been only seven Hawaiian senators.And one of their seats is the only Senate seat in...

There have been only seven Hawaiian senators.

And one of their seats is the only Senate seat in United States history which has always been held by an ethnic minority!

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The tomato plant is native to the Andes mountains. But they...



The tomato plant is native to the Andes mountains. But they were first domesticated in Mesoamerica. And the tomato does not show up in any archaeological evidence in the Andes – either as residues in food containers or as drawings on ceramics. How and why the tomato plant was domesticated thousands of miles from its homeland remains a historical mystery.

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Visit –>...



Visit –> http://ift.tt/1z1qAb5 to read Leon Festinger’s classic article ‘Cognitive Consequences of Forced Compliance’ in full for free!

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